H3C Technologies H3C S3600 Series Switches - Manual (Page 1149)

1-2
Basic Concepts
LLDP frames
LLDP sends device information in LLDP data units (LLDPDUs). LLDPDUs are encapsulated in Ethernet
II or SNAP frames.
1) Ethernet II-encapsulated LLDP frame format
Figure 1-1 Ethernet II-encapsulated LLDP frame format
The fields in the frame are described in Table 1-1 :
Table 1-1 Description of the fields in an Ethernet II-encapsulated LLDP frame
Field Description
Destination MAC address
The MAC address to which the LLDPDU is advertised. It is fixed to
0x0180-C200-000E, a multicast MAC address.
Source MAC address
The MAC address of the sending port. If the port does not have a MAC
address, the MAC address of the sending bridge is used.
Type The Ethernet type for the upper layer protocol. It is 0x88CC for LLDP.
Data LLDP data unit (LLDPDU).
FCS
Frame check sequence, a 32-bit CRC value used to determine the
validity of the received Ethernet frame.
2) SNAP-encapsulated LLDP frame format
Figure 1-2 SNAP-encapsulated LLDP frame format
Data = LLDPU
(n bytes)
0
Destination MAC address
Source MAC address
Type
15 31
FCS